text: """
  Common interface to several Monte Carlo codes
  """
  
  from ._version import get_versions
  
  __version__ = get_versions()["version"]
  del get_versions
  
  # Standard library modules.
  import os
  import sys
  import importlib
  import pkgutil
  import logging
  
  logger = logging.getLogger(__name__)
  
  # Third party modules.
  import pint
  
  # Local modules.
  import pymontecarlo.options
  import pymontecarlo.options.analysis
  import pymontecarlo.options.detector
  import pymontecarlo.options.model
  import pymontecarlo.options.program
  import pymontecarlo.options.sample
  import pymontecarlo.results
  
  # Globals and constants variables.
  
  # --- Units
  
  unit_registry = pint.UnitRegistry()
  unit_registry.define("electron = mol")
  pint.set_application_registry(unit_registry)
  
  # --- Plug-ins
  
  pymontecarlo_plugins = {
      name: importlib.import_module(name)
      for finder, name, ispkg in pkgutil.iter_modules()
      if name.startswith("pymontecarlo_")
  }
  
  logger.debug("Plug-ins: {}".format(", ".join(pymontecarlo_plugins)))
  